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Seed potato disease problems faced and control strategies


% -5%. 17 prefectures in Yunnan Province (City) has a bacterial wilt,[link widoczny dla zalogowanych], especially in parts of the original seed production networks virus-free indoor serious bacterial wilt, and even crops. 2 production of healthy seed potato and seed potato production countermeasures facing the threat of a variety of pathogenic microorganisms, in addition to seed potato production all over the uneven level of virus-free seed potato quality varies greatly,[link widoczny dla zalogowanych], farmers awareness of disease prevention is weak, so the following control strategies: 2.1 establish the concept of using the face of healthy seed potato and seed contaminated with high rates of real and establish the concept of using healthy seed from the source to solve the problem, so as to achieve more with less purpose. 2.2 reduce the infection rate of virus-free seed potato in Yunnan Province, according to local standards, Source Table 1 potato powder scab disease in Yunnan Province in the summer and winter compared the incidence of head clearance. 2.3 The establishment of the traditional customary system of seed potato fields, Yunnan Province, the main producing areas of the seed potato is the main source of the annual post-harvest tuber small or large potato, then cut planting time next year, this approach can not guarantee potato the quality of the block, cut, the man spread the pathogen. Therefore, the following suggestions: potato fields in the corresponding plots for the coming year, leaving part of the seed sources; in seed potato fields should increase planting density to produce a large number of potato tuber small, but to achieve healthy seed potatoes with the whole purpose of sowing; strengthen the management of seed cultivation fields, so that high-earth and earth more than 2 to reduce the risk of exposure to pathogens and potato; 2 weeks before the potato harvest within 1 month a chemical control; if bacterial disease found in potato fields, around the diameter of 2m in the diseased plants within a seed potato tubers can not be used for. Should pay attention to the first harvest harvesting healthy tubers, tuber disease after treatment. Stored seed potato storage should be 2.4 in the air better, shimmer and dry place,[link widoczny dla zalogowanych], with a large number of commercial potato separately, to avoid the occurrence of disease during storage. 3 Discussion of rice, wheat, corn production, a long time to stay in farming or farming system as an important aspect of production, seed potato production can learn this way, conditions in the main producing areas in the state (city) and enterprises can be unified for the species, establish seed supply network. Is a lazy potato crops, farmers have long l44 on Agricultural Science and Technology 2oo3 by chemical treatment I dry pea potato blight efficacy trials Lixian Ping, Sun Maolin, Li Shulian, Dong Lu Feng, Zhou Shiguo (1. Yunnan Academy of Agricultural Biotechnology Research Institute, Kunming, Yunnan 650223, China; 2. Institute of Plant Protection, Yunnan Academy of Agricultural Sciences, Kunming, Yunnan 650205, China; 3. Kunming Agricultural Technology Extension Station, Kunming, Yunnan 650034, China; 4. Luquan County Agricultural Technology Extension Station, Yunnan Luquan 651,511) from the potato late Phytophthora [Phytophtora, sf (Mont.) deBary] potato late blight caused the potato in Yunnan Province for a large spring and autumn for the major diseases of potato processing varieties particularly serious hazard. Late blight susceptible varieties for processing, the incidence of serious problems,[link widoczny dla zalogowanych], test to be adopted by the screening of several chemicals, the best choice out of control late blight agent and method used to guide large-scale processing plant of potato varieties for Yunnan Province, a large area of prevention and control of potato late blight to provide a scientific basis. Table 11 Materials and methods 1.1 for fungicides and crop varieties tested pesticides in Table 1, the tested varieties were susceptible to late blight of potato processing varieties of the Atlantic (Atlantic). 1.2 A field plot experiment in efficacy trials Luquan County of Yunnan Province town of scattered pilot base Camp (elevation 2280m). Repeat 3 times for each chemical treatments,[link widoczny dla zalogowanych], residential area of 15m2, located in control areas (spraying water). Disease onset in the first spraying of the pesticide, the number of the tested agents, manufacturers of dosage form content and the habit of extensive cultivation, which is to develop potato industry is disproportionate and, therefore, to strengthen technical training for farmers for potato production is necessary. Improve farmers seed potato production, potato production levels of goods in order to improve the level of the entire industry.
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